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Top Forums Shell Programming and Scripting Removing top few and bottom few rows in a file Post 302946997 by RudiC on Sunday 14th of June 2015 07:35:41 AM
Old 06-14-2015
Nice! To remove the top lines as well as requested, try
Code:
top=2
bot=1
printf "%s\n" "${xx[@]:$top:n-$top-$bot}"
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VLMGR(1)						      Quick Database Manager							  VLMGR(1)

NAME
vlmgr - administration utility for QDBM Villa SYNOPSIS
vlmgr create [-cz|-cy|-cx] name vlmgr put [-kx|-ki] [-vx|-vi|-vf] [-keep|-cat|-dup] name key val vlmgr out [-l] [-kx|-ki] name key vlmgr get [-nl] [-l] [-kx|-ki] [-ox] [-n] name key vlmgr list [-nl] [-k|-v] [-kx|-ki] [-ox] [-top key] [-bot key] [-gt] [-lt] [-max num] [-desc] name vlmgr optimize name vlmgr inform [-nl] name vlmgr remove name vlmgr repair [-ki] name vlmgr exportdb [-ki] name file vlmgr importdb [-ki] name file vlmgr version DESCRIPTION
This manual page documents briefly the vlmgr commands. vlmgr is a utility for debugging Villa and its applications. It features editing and checking of a database. It can be used for database applications with shell scripts. This command is used in the above format. name specifies a database name. key specifies the key of a record. val specifies the value of a record. OPTIONS
A summary of options is included below. For a complete description, see the file:///usr/share/doc/qdbm-doc/spex.html#villacli. -cz compress leaves in the database with ZLIB. -cy compress leaves in the database with LZO. -cx compress leaves in the database with BZIP2. -l all records corresponding the key are dealt. -kx treat key as a binary expression of hexadecimal notation. -ki treat key as an integer expression of decimal notation. -vx treat val as a binary expression of hexadecimal notation. -vi treat val as an integer expression of decimal notation. -vf read the value from a file specified with val. -keep specify the storing mode for `VL_DKEEP'. -cat specify the storing mode for `VL_DCAT'. -dup specify the storing mode for `VL_DDUP'. -nl open the database without file locking. -top key specify the top key of listing. -bot key specify the bottom key of listing. -gt do not include the top key of listing. -lt do not include the bottom key of listing. -max num specify the max number of listing. -desc list in descending order. -ox treat the output as a binary expression of hexadecimal notation. -n do not output the tailing newline. -k output keys only. -v output values only. SEE ALSO
qdbm(3) vltsv(1), villa(3), vlopen(3). AUTHOR
QDBM was written by Mikio Hirabayashi <mikio@fallabs.com>. This manual page was written by Fumitoshi UKAI <ukai@debian.or.jp>, for the Debian project (but may be used by others). Man Page 2005-05-23 VLMGR(1)
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